H11044N_OUTLINE: Outline of the Interpolated Bathymetry Produced
From Data Collected In The Northern Part Of National Oceanic and
Atmospheric Administration (NOAA) Survey H11044 (Geographic)

Abstract:

During 2001 the NOAA Ship RUDE completed charting survey H11044
that covered a roughly 293 km2 area of the sea floor in north-central
Long Island Sound, off Milford Connecticut. Although 100 percent
coverage was achieved with sidescan sonar for charting purposes, only
reconnaissance (spaced line) bathymetry was acquired with shallow-water
multibeam and single-beam systems. Therefore, further processing was
conducted at the USGS's Woods Hole Science Center to provide
bathymetric datasets with more continuous coverage. This project
produced grids and GeoTIFF imagery of the combined and interpolated
shallow-water multibeam and single-beam bathymetry generated from the
northern part of this data set. Anthropogenic wastes, toxic chemicals,
and changes in land-use patterns resulting from residential,
commercial, and recreational development have stressed the environment
of the Sound, causing degradation and potential loss of benthic
habitats. Detailed maps of the sea floor are needed to help evaluate
the extent of adverse impacts and to help manage resources wisely in
the future. Therefore, in a continuing effort to better understand Long
Island Sound, we have interpolated and gridded shallow-water multibeam
and single-beam bathymetric data within specific areas of special
interest.

Horizontal positions are specified in geographic
coordinates, that is, latitude and longitude.
Latitudes are given to the nearest 0.000001.
Longitudes are given to the nearest 0.000001.
Latitude and longitude values are specified in Decimal degrees.

The horizontal datum used is D_WGS_1984.
The ellipsoid used is WGS_84.
The semi-major axis of the ellipsoid used is 6378137.000000.
The flattening of the ellipsoid used is 1/298.257224.

The geographic GeoTIFF of the 10-m interpolated bathymetry
from the northern part of NOAA survey H11044 were imported into the
ArcView 3.3 GIS project view. These acoustic data were outlined using
the available graphic tools then converted to an ArcView 3.3 polygon
shapefile.

Neither the U.S. Government, the Department of the
Interior, nor the USGS, nor any of their employees, contractors, or
subcontractors, make any warranty, express or implied, nor assume any
legal liability or responsibility for the accuracy, completeness, or
usefulness of any information, apparatus, product, or process
disclosed, nor represent that its use would not infringe on privately
owned rights.

Any use of trade, product, or firm names is for descriptive
purposes only and does not imply endorsement by the U.S. Government.

These data are available in Environmental Systems
Research Institute (ESRI) shapefile format. The user must have ArcGIS
or ArcView 3.0 or greater software to read and process the data file.
In lieu of ArcView or ArcGIS, the user may utilize another GIS
application package capable of importing data. A free data viewer,
ArcExplorer, capable of displaying the data is available from ESRI at
www.esri.com.